Handheld Hygrometers, Psychrometers & WBGTs

Measure relative humidity and ensure environments maintain a balanced ecosytem with our range of temperature, air and humidity meters. Also includes humidity and moisture sensors and relative humidity meters. Read More about Handheld Hygrometers, Psychrometers & WBGTs
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40 Products
  1. ETI 810-190 Pocket-Sized Hygro-Thermometer
    ETI logo
    3 In Stock
    ETI 810-190 Pocket-Sized Hygro-Thermometer
    (no reviews)
    £25.20 £21.00
    • Dual capabilities - simultaneously measures air temperature and humidity
    • Portable, handheld and pocket-sized design
    • MAX/MIN measurement mode calculates maximum and minimum values over time
    21 Reward Points
    Price Match Guarantee
    810-190
  2. Extech 44550 Pocket Humidity/Temperature Pen
    Extech logo
    Only 1 In Stock
    Extech 44550 Pocket Humidity/Temperature Pen
    (2)
    £30.00 £25.00
    • Pen-shaped
    • Measures RH and temperature at same time
    • Pocket sized
    25 Reward Points
    Price Match Guarantee
    44550
  3. Sauermann Kimo K-SiHH3 Thermo-Hyrgrometer
    Sauermann / KIMO logo
    Lead Time: 1-2 Weeks
    Sauermann Kimo K-SiHH3 Thermo-Hyrgrometer
    (no reviews)
    £56.34 £46.95
    • Magnetic backing for easy fixing
    • Backlit LCD screen
    • Carrying bag
    46 Reward Points
    Price Match Guarantee
    K-SiHH3
  4. Extech 445580 Humidity/Temperature Pen
    Extech logo
    Only 1 In Stock
    Extech 445580 Humidity/Temperature Pen
    (no reviews)
    £59.99 £49.99
    • Simultaneous display of Temperature (°C/°F) and Relative Humidity
    • Max/Min and Data Hold
    • Built-in self calibration utility allows for field calibrations using optional Relative Humidity calibration bottles
    49 Reward Points
    Price Match Guarantee
    445580
  5. Extech RH300 Hygro Thermometer Psychrometer
    Extech logo
    Lead Time: 1-2 Weeks
    Extech RH300 Hygro Thermometer Psychrometer
    (no reviews)
    £80.34 £66.95
    • Wet bulb measurements without slinging
    • Calculates T1-T2 differential (Air Temperature-External Probe Temperature) using optional probe
    • Unique sensor cap design twists to closed position for protection during storage
    66 Reward Points
    Price Match Guarantee
    RH300
  6. Beha-Amprobe TH-1 Temperature/Relative Humidity Meter
    Beha-Amprobe logo
    Lead Time: 1-2 Weeks
    Beha-Amprobe TH-1 Temperature/Relative Humidity Meter
    (no reviews)
    Discontinued
    • Simultaneously measure air temperature and humidity
    • Compact design
    • Data hold and MIN/MAX functions
    View product for alternatives.
    3311871
  7. Testo 605i Advanced Bluetooth Thermohygrometer Smart Probe
    Testo logo
    5 In Stock
    Testo 605i Advanced Bluetooth Thermohygrometer Smart Probe
    (no reviews)
    £100.98 £84.15
    • Bendable probe head
    • Bluetooth range: up to 100m
    • Designed for use with a smartphone/tablet with the Testo Smart Probe App installed
    84 Reward Points
    Price Match Guarantee
    0560260502
  8. ETI 224-655 6500 Therma-Hygrometer with Fixed Remote Sensor
    ETI logo
    2 In Stock
    ETI 224-655 6500 Therma-Hygrometer with Fixed Remote Sensor
    (no reviews)
    £102.00 £85.00
    • Measures both temperature and humidity levels
    • Flexible sensor attached via 1m PVC lead
    • Calculate dewpoint, MAX/MIN temp/humidity and more
    85 Reward Points
    Price Match Guarantee
    224-655
  9. Testo 605-H1 Thermo-Hygrometer
    Testo logo
    Lead Time: 1-2 Weeks
    Testo 605-H1 Thermo-Hygrometer
    (no reviews)
    £104.04 £86.70
    • Long sensor probe for duct work
    • Measures ambient air temperature and humidity
    • Also calculates dew point
    86 Reward Points
    Price Match Guarantee
    5606053
  10. ETI 6000/6100 Therma-Hygrometer
    ETI logo
    2 Options in Stock
    ETI 6000/6100 Therma-Hygrometer
    (no reviews)
    £108.00 £90.00
    • Two versions available - one with built-in sensor, one with removable external sensor
    • Measure temperature and humidity levels with a high degree of accuracy
    • Dewpoint, MAX/MIN and data hold functions
    90 Reward Points
    Price Match Guarantee
    ETI-6000-6100
  11. TPI SP597 Smart Wireless Temperature & Humidity Probe c/w A597SP Pouch - Optional Pair of SP597s
    TPI logo
    TPI SP597 Smart Wireless Temperature & Humidity Probe c/w A597SP Pouch - Optional Pair of SP597s
    (no reviews)
    £110.39 £91.99
    • Humidity Range: 0 to 100% RH
    • Includes A597SP Pouch
    • Temperature Range: -4 to +140 °F (-20 to +60 °C)
    • Single or pair of SP597s
    91 Reward Points
    Price Match Guarantee
    TPI-SP597-2
  12. Extech RHT510 Humidity and Temperature Meter
    Extech logo
    Only 1 In Stock
    Extech RHT510 Humidity and Temperature Meter
    (no reviews)
    £118.80 £99.00
    • Compatible with a range of probes
    • Suitable for residential and professional settings
    • Easy to use
    99 Reward Points
    Price Match Guarantee
    RHT510
  13. ETI 6002 & 6102 Dual-Display Therma-Hygrometer with Backlight
    ETI logo
    2 Options in Stock
    ETI 6002 & 6102 Dual-Display Therma-Hygrometer with Backlight
    (1)
    £120.00 £100.00
    • Simultaneously measures temperature and humidity
    • Available with integrated sensor, or removeable sensor on flexible lead
    • Backlit LCD screen
    100 Reward Points
    Price Match Guarantee
    ETI-6002-6102
  14. Extech RH350 SuperHeat Psychrometer
    Extech logo
    Lead Time: 1-6 Days
    Extech RH350 SuperHeat Psychrometer
    (no reviews)
    £124.80 £104.00
    • Dual Type K external temperature probe input
    • Simultaneous display of %RH, Temperature and Dew point or Wet Bulb or External Probe Temperatures
    • Built-in RS-232 interface (optional RS-232 cable) - uses Windows° Hyperterminal to download data to a PC
    104 Reward Points
    Price Match Guarantee
    RH350
  15. DiLog DL7102 Digital Humidity and Temperature Meter
    DiLog logo
    2 In Stock
    DiLog DL7102 Digital Humidity and Temperature Meter
    (no reviews)
    £129.60 £108.00
    • Digital meter capable of measuring temperature, humidity, dewpoint temperature and wet-bulb temperature
    • Ideal for field work
    • Compact, ergonomic design
    108 Reward Points
    Price Match Guarantee
    DL7102
  16. Testo 610 Compact Humidity/Temperature Meter
    Testo logo
    Only 1 In Stock
    Testo 610 Compact Humidity/Temperature Meter
    (no reviews)
    £131.58 £109.65
    • Measures both relative humidity and temperature
    • Temperature range of -50 to 50°C
    • Dewpoint/wet bulb calculation
    109 Reward Points
    Price Match Guarantee
    5600610
  17. Beha-Amprobe TH-3 Relative Humidity & Temperature Meter
    Beha-Amprobe logo
    Beha-Amprobe TH-3 Relative Humidity & Temperature Meter
    (no reviews)
    Discontinued
    • Insert into ducts/other difficult applications to measure temperature and relative humidity
    • Dual display of both parameters at the same time
    • MIN/MAX, relative and data hold modes
    View product for alternatives.
    3027060
  18. Extech RH101 Hygro Thermometer + Infrared Thermometer
    Extech logo
    Only 1 In Stock
    Extech RH101 Hygro Thermometer + Infrared Thermometer
    (no reviews)
    £143.88 £119.90
    • Combination Humidity meter plus Infrared Thermometer features a super large backlit dual display
    • Primary display is user selectable for IR or Humidity; Secondary always displays ambient temperature
    • Infrared thermometer has built-in laser pointer and an 8:1 distance to target ratio
    119 Reward Points
    Price Match Guarantee
    RH101
  19. Martindale AV85 Hygro-Anemometer
    Martindale logo
    Lead Time: 1-6 Days
    Martindale AV85 Hygro-Anemometer
    (no reviews)
    £144.00 £120.00
    • Three-functions in one
    • Test airflow, air temperature and humidity
    • Ideal for HVAC work
    120 Reward Points
    Price Match Guarantee
    MARAV85
  20. Beha-Amprobe THWD-3 Relative Humidity Temperature Meter
    Beha-Amprobe logo
    Beha-Amprobe THWD-3 Relative Humidity Temperature Meter
    (no reviews)
    Discontinued
    • Range of -20 degrees Celsius to 60 degrees Celsius
    • Advanced capacitance sensor
    • Measure full range of relative humidity
    View product for alternatives.
    3033042
  21. Extech RH390 Precision Psychrometer (Humidity & Temperature Meter)
    Extech logo
    Only 1 In Stock
    Extech RH390 Precision Psychrometer (Humidity & Temperature Meter)
    (no reviews)
    £166.80 £139.00
    • Dual backlit display
    • Simultaneous display of: Humidity/Temperature, Humidity/Dew Point or Humidity/Wet Bulb
    • Data Hold and Min/Max functions
    139 Reward Points
    Price Match Guarantee
    RH390
  22. Extech HT30 Heat Stress WBGT (Wet Bulb Globe Temperature) Meter
    Extech logo
    5 In Stock
    Extech HT30 Heat Stress WBGT (Wet Bulb Globe Temperature) Meter
    (1)
    £178.80 £149.00
    • Heat Stress Index measures how hot it feels when humidity is combined with temperature, air movement, and radiant heat
    • Black Globe Temperature (TG) monitors the effects of direct solarradiation on an exposed surface
    • In/Out Function displays the WGBT value with or without direct sun exposure
    149 Reward Points
    Price Match Guarantee
    HT30
  23. Testo Smart Probes Mould Kit
    Testo logo
    Lead Time: 1-2 Weeks
    Testo Smart Probes Mould Kit
    (no reviews)
    £201.96 £168.30
    • Identify areas that are susceptible to mould
    • Data logging Smart Probes send measurements wirelessly via Bluetooth to the Testo Smart Probe App
    • Measure ambient temperature, relative humidity and surface temperature
    168 Reward Points
    Price Match Guarantee
    0563000510
  24. Extech RH490 Precision Hygro-Thermometer
    Extech logo
    Lead Time: 1-2 Weeks
    Extech RH490 Precision Hygro-Thermometer
    (no reviews)
    £232.80 £194.00
    • Water vapor in GPP
    • Simultaneous display of: Humidity/Temperature, Humidity/Dew Point or Humidity/Wet Bulb
    • Data Hold and Min/Max functions
    194 Reward Points
    Price Match Guarantee
    RH490

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About Handheld Hygrometers, Psychrometers & WBGTs

Our environment is made of several different elements. While we generally think of oxygen, carbon dioxide, and even nitrogen as forming the bulk of the Earth's atmosphere, the water content in the air is also constantly present. A good quality humidity tester is useful for those who routinely find themselves working in humid environments.

If you've got a lot of people working in one place, keeping the humidity in check is essential. Many people become uncomfortable in humid environments and can even suffer adverse health effects if they are exposed for long enough periods. Asthmatics are particularly affected by humid environments.

It is therefore important for you to regularly test the humidity of an environment to ensure the safety of yourself and your workforce.

High humidity, along with temperature, also affects electronic circuits and machinery, so if you want to keep your installation working within safe limits a hygrometer will be a worthwhile investment. Here are some of the effects you can expect:

Component

Temperature Effect

Humidity Effect

Ceramic capacitors

Changes in dielectric constant and capacitance lowered insulation resistance with high temp.

-

Electrolytic capacitors

Increased electrolyte leakage; shortened life, a large change in capacitance, increased series resistance with low temp.

Decreased insulation resistance increased dielectric breakdown increase in shorts

Tantalum Capacitors

Electrolyte leakage; change in capacitance insulation resistance; series resistance

Decreased insulation resistance increased dielectric breakdown increase in shorts

Transistors

Increased leakage current; changes in gain; increases in opens and shorts

Increased leakage current; decreased current gain, if sealed not effect

Standard Connectors

Flashover, dielectric damage

Shorts fungus; corrosion of contacts lowered insulation resistance

Crystals

Drift

Drift

Switches

Oxidation of contacts

Contact arcing

Thermistors

Increased shorts and opens

Change in resistance

Humidity sensors are also quite commonly referred to as hygrometers. These devices are generally defined into two separate types - humidity meters and humidity sensors. The major difference between the two is that humidity meters are designed as handheld, portable instruments to be carried out and test various applications; a humidity sensor is designed to be mounted in one location such as a wall, and will constantly catalogue the humidity (and other parameters such as temperature) in the environment it is placed in.

A humidity sensor is an extremely beneficial tool in a wide variety of applications. Whether it's simply maintaining the humidity levels in an office or ensuring that excessive water content isn't in the air when storing delicate materials such as wood, these sensors help to alert users when humidity is too high and action must be taken.

Many humidity meters include the ability to measure dewpoint, which is basically when water vapour in an area starts to condense into liquid water. By determining this value users can ensure that humidity in the air doesn't get the chance to turn into water, and this in turn increases safety and stops damage to properties and components.